Siphonolaimus

Siphonolaimus	Contents	Rev: 08/23/2025
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Siphonolaimus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Siphonolaimidae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Monhysterida: Monhysterina
Siphonolaimoidea
Siphonolaimidae: Siphonolaiminae
Siphonolaimus De Man, 1893

Type species of the genus: Siphonolaimus niger De Man, 1893

    Synonyms:

Morphology and Anatomy:

Marine nematodes.

Body length 4-10 mm
Buccal cavity a slender tube, siphon, with axial spear.
Cuticle transversely striated,
Amphid fovea circular
Somatic setae sparsely present on body.
Posterior half of esophagus dilated.
Tail is blunt.
Many species with dark appearance due to presence of dark granules throughout body (ingested sediment?)

Ref: Annapurna et al., 2012; Huang and Guo, 2022

Females:

Monodelphic, prodelphic
Female tail 0.7-1.0 abd long

Siphonolaimus japonicus A: Male; B: Female; C:Male anterior with amphid, siphon and pharync; D: Male tail; spicules, gubernaculum, caudal glands.
Scal bars: A,B = 200 um, C = 25 um; D = 100um
Drawings from Zograf et al., 2015

Males:

Six prominent setose precloacal supplements.
Monorchic
Spicule 56-63um
Male tail 1.2-1.5 cbd.,

Body size range for the species of this genus in the database - Click:

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Distribution:

Populations of different species described from sublittoral assemblages in the upper 5 cm of sandy-silt sediment in the English Channel and coast of Scotland. Also species found at depths of 250 m off northeast coast of India and in Sea of Japan..

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Feeding:

Food Sources and Feeding strategies for the genus Siphonolaimus

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Biology and Ecology:

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Life Cycle:

For Ecophysiological Parameters for this genus, click

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Ecosystem Functions and Services:

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Management:

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References:

Annapurna, C., Vijaya Bhanu, C., Srinivasa Rao, M., Sivalakshmi, M.V., Lilly M. .Cooper, G., Rao, Y.K. 2012. Free-living nematodes along the continental slope off northeast coast of India. J. Mar. Biol. Ass. India, 54:52-60.

Huang, Y., Guo, Y. 2022. Order Monhysterida Filipjev, 1929. In: Free-living Marine Nematodes from the East China Sea. Springer, Singapore. https://doi.org/10.1007/978-981-16-3836-7_{_}9

Platt, H. M. and R. M. Warwick. 1988. Free-living marine nematodes. Part II: British Chromadorids. Synopses of the British Fauna (New Series) NO. 38, Brill, E.J., Leiden, 501pp

Zograf, J., Trebukhova, Y., Pavlyuk, O. 2015. New deep-sea free-living marine nematodes from the Sea of Japan: the genera Siphonolaimus and Halichoanolaimus (Nematoda: Chromadorea) with keys to species identifications. Zootaxa 3911 (1) 63-80

Siphonolaimus

Copyright © 1999 by Howard Ferris. Revised: August 23, 2025.

Copyright © 1999 by Howard Ferris.
Revised: August 23, 2025.